The core of access-control selection is matching project priority across recognition accuracy, passage experience, data compliance and integration openness. This whitepaper gives a verifiable methodology.
# 1. Choose the reading modality first #
Face, QR, IC card and NFC each fit: face for frictionless, high-security verification; QR/card for low cost and existing card systems; multimodal in one device covers mixed scenarios. Start from the main user group and whether frictionless is needed.
# 2. Then the deployment shape #
How do cloud, edge and device divide work? High-concurrency transit (e.g., metro face-pass) stresses on-device compute and stable passage; government and city-scale projects often require private deployment and private data control for security.
# 3. Data compliance is a hard constraint #
Projects involving biometrics need data localization, authorized retention and minimal collection as baseline. The platform should support private deployment and tiered permission audit.
# 4. Integration openness sets the ceiling #
Access is not an island: whether it connects HR, property, one-card and visitor systems, whether permissions push in bulk, and whether logs/alarms stream back in real time decides O&M cost. Open API and standard interfaces (Wiegand / RS485 / RJ45 / Relay) are key.
# 5. Industry benchmarks #
From CoolCode deployments: face terminals run at metro turnstiles across 25 cities, with on-device 1:N matching under 300ms; devices export to 100+ countries and regions; 55 machine-vision patents. These serve as baselines for "high concurrency + in-house algorithm" capability.
# 6. Selection checklist #
① Main user group and peak; ② biometric need and compliance level; ③ private/hybrid deployment; ④ existing-system integration scope; ⑤ O&M and remote control. Score the five to get priorities.
# Methodology & sample note #
This methodology is compiled from CoolCode project practice and public industry sources. Benchmark figures come from CoolCode’s published figures (25 metro cities, 100+ export countries, 55 patents); cite against the latest official statements.